fix: avoid styled-jsx parsing SVG cursor styles

[tangly1024]

Summary

• Replace inline SVG style='filter: ...' inside Endspace cursor data URLs.
• Keep the cursor shadow effect by drawing a second offset SVG path instead of embedding CSS inside the SVG.

Why

styled-jsx can misread the inline SVG style attribute inside a CSS url("data:image/svg+xml;...") value and fail the build with:

Nesting detected at 102:7. Unfortunately nesting is not supported by styled-jsx.

Flattening ordinary CSS selectors does not address this specific failure, because the parser is tripping over CSS text embedded in the SVG data URL.

Validation

• Verified themes/endspace/style.js transforms successfully with next/babel and styled-jsx/babel.

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